Jacob Simon de Vries - Blok Born 9- Mar 1873 Leeuwarden-Friesland, Netherland. Son of Simon de Vries - Reijzer and Betje Blok - du Mosch Married to: Bettie Goudsmit - Keiser Born 3- Apr 1880 Amsterdam, Netherland. Daughter of Simon Philip Goudsmit and Sara Keiser |